A Cu-catalyzed allyl−aryl coupling reaction between (Z)-acyclic or cyclicallylicphosphates and arylboronates proceeds with excellent γ-E-selectivity and 1,3-anti chirality transfer, which gives the corresponding coupling products with benzylic and allylic stereogenic centers. The wide availability and easy-to-handle nature of arylboronates, the inexpensiveness of the Cu catalyst system, and the high
Efficient Preparation of β-Branched γ,δ-Unsaturated Esters through Copper-Catalyzed Allylic Alkylation of Ketene Silyl Acetal
作者:Hirohisa Ohmiya、Masaya Sawamura、Dong Li
DOI:10.1055/s-0031-1289712
日期:2012.5
Copper-catalyzed allylic alkylation of ketene silyl acetals proceeded with excellent γ-E-selectivity. Efficient α-to-γ chirality transfer with anti-selectivity occurred in the reaction of enantioenriched secondary allylic phosphates, affording enantioenriched β-branched γ,δ-unsaturated esters. The reaction was readily scalable and highly reliable in terms of product yield and stereoselectivities. γ